Die casting machine



Aug. 1, 1933. ca. AICHELE DIE CASTING MACHINE Fil ed May 4, 1952 2 Sheets-Sheet l Jnvonlor.

Aug. 1, 1933. s. AICHELE 1,920,520

DIE CASTING MACHINE Filed 1m 4, 1952 2 Sheets-Sheet 2 v I A, i I

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Patented Aug. 1 1933 1,920,620 ma oas'rmo MACHINE Gottlob Aichele, Nellingen, near Stuttgart, Germany, assignor to Daimler-Benz Aktiengesellschaft, Stuttgart-Unterturkheim, Germany, a Company of Germany Application May 4, 1932, Serial No. 609,193, and in Germany May 6, 1931 7 Claims.

This invention relates to a die casting machine for instance for casting the liners of bearing steps, and has for its object to simplify the manufacturing process so that all the more important stages in the manufacture are combined in a single operation. More particularly the clamping and the pouring into the mould are to be effected for instance by a single actuation of a lever. This is suitably effected by means of a hand .lever combined with a cam disc. This operation can also be combined with the actuation of a discharging device and of other arrangements connected with the operation.

As compared with known similar arrangements the invention has the advantage of greater Simplicity in construction and operation and is not dependent on external sources of power, for instance electric, hydraulic or other sources. It can therefore be installed anywhere. Should a mechanical drive be considered desirable, this could of course be provided without the machine having to be modified in its essential parts. The clamping device forming a part of theinvention can also be used with advantage in power-driven machines.

In the accompanying drawings a construc tional example of the invention is shown,

Fig. 1 being a diagrammatic front elevation of the machine,

Fig. 2 the same in side elevation, and

Fig. 3 a similar side elevation with the operative parts in another position.

Fig. 4' represents the cam disc of Figs. 2 and 3 to an enlarged scale,

Fig. 5 isa section through the clamping device,

Fig. 6 a section on line AA of Fig. 7,

Fig. '7 a'section on line C-D of Fig. 5,

Fig. 8 a section on line B--B of Fig. 7.

In the upper part of the machine frame 1 is the heated crucible 2 with the pressure chamber 3. In a cylindrical extension of the latter a piston 4 is slidable, which is adapted to cover or uncover the opening 5. 6 is the injection nozzle through which the fluid material is injected into the mould lying above it, which is held by the clamping device 7.

. The actuation is effected by thelever 9 which is pivoted at 8. This lever is connected by abar 10 to the cam discs 12 which'are rotatable about I 0 the shaft 11 and are provided with the cam slots 13, in which the pins 14 of the pull bars 15 are guided-which latter are guided in the frame. By means of an arm. 16 which is rigidly connected to the lever 9 and a bar 17 pivoted on the arm 16, the piston 4 is actuated.

' manner.

In Figs. 2'and 3 the two extreme positions of. the lever 9 and of the other gear members are shown diagrammatically. The machine operates as follows:

On the lever 9 beingbrought from the position shown in Fig. 2 into that shown in Fig. 3, the cam discs 12 are turned by the bars 10 in the counter-clockwise direction about the shaft 11. The controlling cams 13 are so designed, as shown in Fig. 4, that the controlling radius of the length n at the point P gradually decreases to the smaller length r: in the point Q, from which point onwards it remains constant during the remainder of the stroke up to the point R. During the motion of the pins from P to Q when the said discs are being turned, there is therefore a downward motion of the bars 15 and conse quently a. stressing of the resilient device '7. During this stroke the lever 16, Fig. 2, is also moved in the counter-clockwise direction, during which motion it travels past the top position and produces in the first instance an ineffective to and fro motion of the piston 4. Only when the piston, during the last part of the stroke corresponding to the part Q- -R of the cam, closes the opening 5, the effective part of the piston stroke commences, during which the fluid casting material is forced through the nozzle 6 into the mould.

One constructional form of the stressing device is shown in Figs. 5 to 7, the lower extreme position being represented. This device consists substantially of a base plate 18, the middle part 19 of the mould and the stressing plate 20. The latter is connected at both ends by nuts with the pull bars 15 and is moved by the latter upwards and downwards in a positive All three plates 18, 19 and 20 are guided vertically by bars 21' which are fixed in the machine frame. With the upper stressing plate a ring-shaped part 22- is connected, which fits into a corresponding recess in the middle part 19 and is adapted to slide in the latter in the vertical direction. A semi-circular extension 23 of the ring bears, in the bottom position shown, against the bearing step 24, which has previously been placed on the base plate 18 and is centered by the conical surfaces 25 and and 20 are adapted to slide with respect to one another yieldingly within certain limits, one or more springs 29 being provided between the upper and middle plate and the springs so between the middle and the lower plate. -It is assumed that the force. of the former springs is greater than that of the latter. Into the lower'plate pins 31 are screwed, the heads 32 of which act as stops for limiting the relative'lift of the upper plate. Pins 33 with heads 34 limit the lift f betwen the middle and the upper plate in a similar manner.

As is shown in Fig. 6,one or two two-armed levers 35 are pivoted on the middle plate, the lower arms 36 of which are adapted to displace pins 37. The ends 38 of the latter bear against the end surfaces of the bearing step, so that on the pins being displaced the bearing step is forced away. At the other end of the lever or the two levers 35 is a pin 39, which is adapted to slide in an adjustable cam groove 40 fixed to the machine frame.

For cooling the middle plate by air or water a bore 41 is' provided, in which are inserted the concentric tubes 42 and 43. For cooling the lower plate the bores 44 are provided. The device is in its bottom position, the platejlil bearing against the nozzle 6 and the bearing step 24 beingpressed by the stressing piece 23 against the lower base plate. In this position the fluid bearing metal can be injected through the nozzle and the gate 28 into the chamber 45 for casting the liner in the bearing step 24. In this position the pin 14 is between the points Q and R. of the cam 13 (Fig; 4). During. the return motion from Q to P the device is relieved of stress, the plate 20 being lifted by the bars 15. During this part of the motion the plates 19 and '18 at'first remain stationary, while the spring or springs 29 are being relieved of stress,

until the plate 20 has moved through a distance ,f and engages the pin head 34 so that during the continued movement of the plate 20 the middle plate 19 is carried along with it. After a stroke e the base plate 18 is also carried along by the head 32 of the pin 31 andthe nozzle 6 is uncovered, so that the danger of the latter becoming stopped up by cooling material is diminished. The stroke 6 must be shorter than the total lift 1'1-12.

' When the middle plate 19 is raised, the pin- 39 of the lever 35 bears against the guiding edge of the fixed cam groove 40 (Fig. 6), being forced by the latter to the left. The pins 37 consequently move to the right and force the finished, bearing step '24 out of the centered position. For accelerating this motion the cam 13 (Fig. 4) is made specially steep at the corresponding point S. v

The stressing motion takes place in the corresponding reversed order; In the first instance the discharging pins are withdrawn, whereupon or during which motion the plate 18 is brought to bear on the nozzle 6. Thereupon the mould is tightly closed by the middle plate 18 resting on the base plate and finally the bearing step is clamped by the upper plate with the clamping piece 23. H I

The device can of course also be used for casting any other articles and the machine and the device can also be modified considerably without exceeding the scope of the invention.

What I claim is: 1. In a die casting machine for casting machine bearing liners having opposed mould parts for clamping a bearing step placed between them, an abutment for the bearing step between said opposed mould parts, saidabutment having a core member and adapted to co-operate with the opposed mould parts and the bearing step to form a mould to receive the liner metal, and means for forcing molten liner metal into the mould between the core member and the bearing step, actuating means for moving the said mould parts towards and away from one another and an operating lever operatively connected thereto and to the means. for forcing the molten liner metal into the mould, so as to enable the mould-clamping and casting operations to be effected by a single operation of the said lever. 2. In a die casting machine for casting bearing liners having opposed mould parts for clamping a bearing step placed between them, an abutment for the bearing step between said opposed mould parts, said abutment having a core member and adapted to co-operate with the opposed mould parts and the bearing step to form a mould to receive the linermetal, and means for forcing molten liner metal into the mould between the core member and the bearing step, actuating means for moving the said mould parts towards and away from one another, ejecting means for ejecting the bearing step movable in said abutment, an operating lever operatively connected to said actuating means for the mould parts and to the means for forcing themolten liner metal into the mould, so as to enable the mouldclamping and casting operations to be efiected by a single operation of the said lever and actuating means for said ejecting means, comprising a movable operating memberconnected to the abutment and a stationary member fixed on the machine and arranged to move said operating member to actuate the ejecting means i on the clamping members being moved away from one another.

3. In a die casting machine for casting bearing liners having opposed mould parts for clamping a bearing step placed between them, an abutment for the bearing step between 'said opposed mould parts, said abutmenthaving a core member and adapted to co-operate with the opposed mould parts and the bearing step to form a mould to receive the liner metal, and means for forcing molten liner metal into the mould between the core member and the bearing step, actuating means for moving the said mould parts towards and away from one another including an actuating member, a cam disc having a cam track comprising an effective portion and a non-effective portion and an operating lever connected to the cam disc, said actuating member being in engagement with the cam track and so as to coact with the effective portion thereof to move the mould parts towards one another to clamp the bearing step in the initial movement of the cam disc .in one direction and to coact with the non-effective portion of the cam track during the continued movement of the cam disc in said direction so as to maintain the mould parts stationary in the clamping position, and actuating means connected to the said lever and to the means for forcing the molten'liner metal into the mould, said actuating means beingarranged to actuate said means 'to forcethe liner metal into the mouldonly when the actuating member in 1 engagement with. the cam disc coacts with the non-effective cam track portion, so that in the first part of the movement of the operating lever the mould parts are moved to clamp the bearing step and in the second part of the movement of the operating lever the metal is forced into the mould.

4. The die casting machine as set forth in claim 3, the cam track comprising a slot having a portion the distance .of which from the axis of rotation of the cam disc decreases from a maximum distance corresponding to the maximum' spacing of the mould parts from one another to a minimum distance corresponding to the clamping position of the mould parts and a portion adjacent the minimum distance point, the distance of which from the axis of rotation is constant and equal to the said minimum distance.

5. In a die casting machine for casting bearing liners having opposed mould parts for clamping a bearing step placed between them, an abutment for the bearing step between said opposed mould parts, said abutment having a core member and adapted to co-operate with the opposed- 'mould parts and the bearing step to form a mould to receive the liner metal, and means for forcing molten liner metal'into the mould between the core member and the bearing step, said means comprising a pressure chamber having a cylindrical extension and a piston slidable in said extension, actuating means for moving the said mould parts towards and away from one another, including a cam disc having a cam track comprising an effective portion and a noneffective portion, an actuating member inengagement .with the camtrack and so as to coact with the efiective portion thereof to move the mould parts towards one another to clamp the bearing step in the initial movement of the cam disc in one direction and to coact with the non-efiective portion of the cam track during the continued movement of the cam disc in said direction so as to maintain the mould parts stationary in the clamping position, an operating lever operatively connected to the cam disc and a link connected to the said piston and operating lever and arranged to produce an idle motion of the piston during the initial movement of the cam disc and to actuate the piston during the latter part of the movement of the cam disc for forcing the molten liner metalinto the mould, so as to enable the mould-clamping and casting operations to be effected by a single operation of the said operating lever.

6. In a die casting machine for casting bearposed mould parts, said abutment having a core I member and adapted to co-operate with the opposed mould parts and the bearing step to form a mould to receive the liner metal, and means for forcing molten liner metal into the mould between the core memberand the bearing step, actuating means for moving the said mould parts towards and away from one another, ejecting means for ejecting the bearing step comprising two pins movable in said abutment and'arranged with their ends to contact with the end surfaces of the bearing step, an operating lever operatively connected to the actuating means for moving the mould parts and to the means for forcing the molten liner metal into the mould, so as to enable the mould-clamping and casting operations to be effected by a single operation of the said lever.

'7. In a die casting machine for casting bearing liners having opposed mould parts for clamping a bearing step placed between them, an abutment for the bearing step between said opposed mould parts, said abutment having a core member and adapted to co-operate with the opposed mould parts and the bearing step to form a mould to receive the liner metal, and means for forcing molten liner metal into the mould between the core member and the bearing step, actuating means for moving the said mould parts towards and away from one another, ejecting means for ejecting the bearing step comprising two pins movable in said abutment and arranged with their ends to contact with the end surfaces of the bearing step, an operating lever operatively connectedto the actuating means for moving the mould parts and to the means for forcing the molten liner metal into the, mould, so as to enable' the mouldclamping and casting operations to be effected by a single operation of the said lever and actuating means for saidejecting pins, comprising two-armed levers pivoted to the abutment one arm of each lever connected respectively to one of said pins for displacing the pins and the other arm having a pin at the end thereof, the machine frame having adiustable members thereon with cam grooves each of said pins on said arms coacting respectively with one of. said cam grooves to actuate the ejecting pins on the clamping members being moved away from one another.

GO'I'ILOB AICHELE; 

